The male lower body has a fishy smell, then the possible causes are as follows: 1, the foreskin is too long or prepuce, in the process of urination always have a little urine residue in the foreskin, over time will cause fishy smell, plus if the patient usually can not do regular cleaning, keep the local clean, will aggravate the fishy smell. This situation is generally not accompanied by any conscious symptoms, there will be no pain, redness, increased secretions and so on. It is recommended that patients undergo circumcision, and pay attention to personal hygiene, wash regularly to keep the local clean and dry; 2, infection of the external genitalia, such as circumcision glansitis, etc., can cause an increase in local secretions or accompanied by bacterial infection, which can breed fishy odor. This can be accompanied by local redness or a little exudation, erosion and other changes, but also accompanied by frequent urination, urinary urgency and other symptoms. In addition to maintaining local hygiene, this condition also requires medical treatment, such as local cleaning and soaking with potassium permanganate solution or topical treatment with anti-bacterial ointment.